中国煤储层渗透率分级方案探讨

发布时间：2018-06-22 08:41

  本文选题：煤层气 + 渗透率　； 参考：《煤炭学报》2017年S1期

【摘要】：统计分析了国内外不同煤阶和地区的煤储层渗透率数据,显示国外相同煤阶煤储层的渗透率要比我国高1~2个数量级,且我国不同煤阶煤储层渗透率整体上差异不大。研究表明,煤储层的渗透性主要受现今地应力强度和构造史及与其伴随的流体活动史决定的煤体结构、割理发育程度和割理充填状况等因素控制,高应力、复杂煤体结构和割理充填,是中国低渗透煤储层的基本成因机理。基于我国煤储层渗透率分布特点和不同渗透率条件下单井产量的分析,将有效煤储层的渗透率下限定为0.01×10~(-15)m2,按渗透率将有效煤储层划分为低渗(k=0.01×10~(-15)~0.1×10~(-15)m2)、中渗(k=0.1×10~(-15)~0.5×10~(-15)m2)、中高渗(k=0.5×10~(-15)~1×10~(-15)m2)、高渗(k=1×10~(-15)~5×10~(-15)m2)和超高渗(k5×10~(-15)m2)5个等级,煤层气井的实际产量除受渗透率影响外,还受到煤层厚度、含气量、压裂参数、地质构造、煤系地层含水性和排采工作制度等其他因素的影响,随着我国煤层气开发技术的进步,低渗煤储层(k=0.01×10~(-15)~0.1×10~(-15)m2)经合理配套的压裂技术和排采方案仍可获得理想的产气量。
[Abstract]:The permeability data of different coal ranks and regions at home and abroad are statistically analyzed. The results show that the permeability of the same rank coal reservoirs abroad is 1 ~ 2 orders of magnitude higher than that of China, and the overall permeability of different coal rank coal reservoirs in China is not different as a whole. The study shows that the permeability of coal reservoir is mainly controlled by such factors as the present stress intensity and tectonic history and the associated fluid activity history, such as the coal body structure, the degree of cleat development and the condition of cleat filling, and so on. Complex coal structure and cleat filling are the basic genetic mechanism of low permeability coal reservoirs in China. Based on the characteristics of permeability distribution of coal reservoirs in China and the analysis of single well production under different permeability conditions, 灏嗘湁鏁堢叅鍌ㄥ眰鐨勬笚閫忕巼涓嬮檺瀹氫负0.01脳10~(-15)m2,鎸夋笚閫忕巼灏嗘湁鏁堢叅鍌ㄥ眰鍒掑垎涓轰綆娓，

本文编号：2052262